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| Effect of Phosphorus on Mechanical Properties of Fine-Grained GH4133 Nickel Base Superalloy |
| SUN Wenru; GUO Shouren; MENG Xiaona; LI Na; HU Zhuangqi |
| Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
SUN Wenru; GUO Shouren; MENG Xiaona; LI Na; HU Zhuangqi. Effect of Phosphorus on Mechanical Properties of Fine-Grained GH4133 Nickel Base Superalloy. Acta Metall Sin, 2004, 40(5): 477-482 .
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Abstract Apposite phosphorus content can improve the mechanical properties of the
fine-grained GH4133 nickel-base superalloy. The grain size of
the alloy was refined to ASTM 8-10 grade by controlling the thermal processing and the
heat treatment. The tensile specimens fail by intergranular fracture even when the
phosphorus level is as high as 0.140\% (mass fraction). The yield and ultimate
strengths of the refined alloy are 200 and 150 MPa higher than that of the alloy with a
standard microstructure of ASTM 4-5 grain size, respectively. And
the above two strengths of the alloy with
0.140%
phosphorus are 100 and 50 MPa higher than those of the alloy with a industrial
controlled phosphorus level, say 0.005%. The impact specimens fail by intragranular
fracture when the phosphorus level is below 0.023% and the fracture toughness of the
alloy is higher than 70 MJ/m2. Some parts of the fracture surface of the impact
specimen with 0.140\% phosphorus exhibited intergranular fracture
characteristics and the fracture toughness is lowered to about 40
MJ/m2. Phosphorus
extends the rupture life of the GH4133 alloy and its optimum addition is
around 0.011%. The interaction between phosphorus atmosphere and dislocations is discussed
to understand the effect of phosphorus on different type of mechanical
properties.
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Received: 19 February 2003
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